{"id":1365,"date":"2024-06-02T22:24:35","date_gmt":"2024-06-02T22:24:35","guid":{"rendered":""},"modified":"2024-06-05T03:09:46","modified_gmt":"2024-06-04T19:09:46","slug":"underscore-%e7%b3%bb%e5%88%97%e4%b9%8b%e5%ae%9e%e7%8e%b0%e4%b8%80%e4%b8%aa%e6%a8%a1%e6%9d%bf%e5%bc%95%e6%93%8e%e4%b8%8b","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1365","title":{"rendered":"underscore \u7cfb\u5217\u4e4b\u5b9e\u73b0\u4e00\u4e2a\u6a21\u677f\u5f15\u64ce(\u4e0b)"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u672c\u7bc7\u63a5\u7740\u4e0a\u7bc7 underscore \u7cfb\u5217\u4e4b\u5b9e\u73b0\u4e00\u4e2a\u6a21\u677f\u5f15\u64ce(\u4e0a)<\/a>\u3002<\/p>\n

\u9274\u4e8e\u672c\u7bc7\u6d89\u53ca\u7684\u77e5\u8bc6\u70b9\u592a\u591a\uff0c\u6211\u4eec\u5148\u6765\u4ecb\u7ecd\u4e0b\u4f1a\u7528\u5230\u7684\u77e5\u8bc6\u70b9\u3002<\/p>\n

\u53cd\u659c\u6760\u7684\u4f5c\u7528<\/h2>\n
<\/p>\n
var<\/span> txt<\/span> =<\/span> \"We are the so-called \"<\/span>Vikings<\/span>\" from the north.\"<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>txt<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u7684\u672c\u610f\u662f\u60f3\u6253\u5370\u5e26 \"\"<\/code> \u5305\u88f9\u7684 Vikings<\/code> \u5b57\u7b26\u4e32\uff0c\u4f46\u662f\u5728 JavaScript \u4e2d\uff0c\u5b57\u7b26\u4e32\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u8005\u53cc\u5f15\u53f7\u6765\u8868\u793a\u8d77\u59cb\u6216\u8005\u7ed3\u675f\uff0c\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u62a5 Unexpected identifier<\/code> \u9519\u8bef\u3002<\/p>\n
\u5982\u679c\u6211\u4eec\u5c31\u662f\u60f3\u8981\u5728\u5b57\u7b26\u4e32\u4e2d\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u8005\u53cc\u5f15\u53f7\u5462\uff1f<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u53cd\u659c\u6760\u7528\u6765\u5728\u6587\u672c\u5b57\u7b26\u4e32\u4e2d\u63d2\u5165\u7701\u7565\u53f7\u3001\u6362\u884c\u7b26\u3001\u5f15\u53f7\u548c\u5176\u4ed6\u7279\u6b8a\u5b57\u7b26\uff1a<\/p>\n
<\/p>\n
var<\/span> txt<\/span> =<\/span> \"We are the so-called \\\"Vikings\\\" from the north.\"<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>txt<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u73b0\u5728 JavaScript \u5c31\u53ef\u4ee5\u8f93\u51fa\u6b63\u786e\u7684\u6587\u672c\u5b57\u7b26\u4e32\u4e86\u3002<\/p>\n
\u8fd9\u79cd\u7531\u53cd\u659c\u6760\u540e\u63a5\u5b57\u6bcd\u6216\u6570\u5b57\u7ec4\u5408\u6784\u6210\u7684\u5b57\u7b26\u7ec4\u5408\u5c31\u53eb\u505a\u201c\u8f6c\u4e49\u5e8f\u5217\u201d\u3002<\/strong><\/p>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u8f6c\u4e49\u5e8f\u5217\u4f1a\u88ab\u89c6\u4e3a\u5355\u4e2a\u5b57\u7b26\u3002<\/p>\n
\u6211\u4eec\u5e38\u89c1\u7684\u8f6c\u4e49\u5e8f\u5217\u8fd8\u6709 \\n<\/code> \u8868\u793a\u6362\u884c\u3001\\t<\/code> \u8868\u793a\u5236\u8868\u7b26\u3001\\r<\/code> \u8868\u793a\u56de\u8f66\u7b49\u7b49\u3002<\/p>\n
\u8f6c\u4e49\u5e8f\u5217<\/h2>\n
\u5728 JavaScript \u4e2d\uff0c\u5b57\u7b26\u4e32\u503c\u662f\u4e00\u4e2a\u7531\u96f6\u6216\u591a\u4e2a Unicode \u5b57\u7b26\uff08\u5b57\u6bcd\u3001\u6570\u5b57\u548c\u5176\u4ed6\u5b57\u7b26\uff09\u7ec4\u6210\u7684\u5e8f\u5217\u3002<\/p>\n
\u5b57\u7b26\u4e32\u4e2d\u7684\u6bcf\u4e2a\u5b57\u7b26\u5747\u53ef\u7531\u4e00\u4e2a\u8f6c\u4e49\u5e8f\u5217\u8868\u793a\u3002\u6bd4\u5982\u5b57\u6bcd a<\/code>\uff0c\u4e5f\u53ef\u4ee5\u7528\u8f6c\u4e49\u5e8f\u5217 \\u0061<\/code> \u8868\u793a\u3002<\/p>\n
\n
\u8f6c\u4e49\u5e8f\u5217\u4ee5\u53cd\u659c\u6760 \\<\/code> \u5f00\u5934\uff0c\u5b83\u7684\u4f5c\u7528\u662f\u544a\u77e5 JavaScript \u89e3\u91ca\u5668\u4e0b\u4e00\u4e2a\u5b57\u7b26\u662f\u7279\u6b8a\u5b57\u7b26\u3002<\/p>\n<\/blockquote>\n
\n
\u8f6c\u4e49\u5e8f\u5217\u7684\u8bed\u6cd5\u4e3a \\uhhhh<\/code>\uff0c\u5176\u4e2d hhhh \u662f\u56db\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u3002<\/p>\n<\/blockquote>\n
\u6839\u636e\u8fd9\u4e2a\u89c4\u5219\uff0c\u6211\u4eec\u53ef\u4ee5\u7b97\u51fa\u5e38\u89c1\u5b57\u7b26\u7684\u8f6c\u4e49\u5e8f\u5217\uff0c\u4ee5\u5b57\u6bcd m<\/code> \u4e3a\u4f8b\uff1a<\/p>\n
<\/p>\n
\/\/ 1. \u6c42\u51fa\u5b57\u7b26 `m` \u5bf9\u5e94\u7684 unicode \u503c<\/span>\nvar<\/span> unicode<\/span> =<\/span> 'm'<\/span>.<\/span>charCodeAt<\/span>(<\/span>0<\/span>)<\/span> \/\/ 109<\/span>\n\/\/ 2. \u8f6c\u6210\u5341\u516d\u8fdb\u5236<\/span>\nvar<\/span> result<\/span> =<\/span> unicode<\/span>.<\/span>toString<\/span>(<\/span>16<\/span>)<\/span>;<\/span> \/\/ \"6d\"<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528 \\u006d<\/code> \u8868\u793a m<\/code>\uff0c\u4e0d\u4fe1\u4f60\u53ef\u4ee5\u76f4\u63a5\u5728\u6d4f\u89c8\u5668\u547d\u4ee4\u884c\u4e2d\u76f4\u63a5\u8f93\u5165\u5b57\u7b26\u4e32 '\\u006d'<\/code>\uff0c\u770b\u4e0b\u6253\u5370\u7ed3\u679c\u3002<\/p>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f: \\n<\/code> \u867d\u7136\u4e5f\u662f\u4e00\u79cd\u8f6c\u4e49\u5e8f\u5217\uff0c\u4f46\u662f\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e0a\u9762\u7684\u65b9\u5f0f\uff1a<\/p>\n
<\/p>\n
var<\/span> unicode<\/span> =<\/span> '\\n'<\/span>.<\/span>charCodeAt<\/span>(<\/span>0<\/span>)<\/span> \/\/ 10<\/span>\nvar<\/span> result<\/span> =<\/span> unicode<\/span>.<\/span>toString<\/span>(<\/span>16<\/span>)<\/span>;<\/span> \/\/ \"a\"<\/span><\/pre>\n<\/div>\n
\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7528 \\u000A<\/code> \u6765\u8868\u793a\u6362\u884c\u7b26 \\n<\/code>\uff0c\u6bd4\u5982\u5728\u6d4f\u89c8\u5668\u547d\u4ee4\u884c\u4e2d\u76f4\u63a5\u8f93\u5165 'a \\n b'<\/code> \u548c 'a \\u000A b'<\/code> \u6548\u679c\u662f\u4e00\u6837\u7684\u3002<\/p>\n
\u8bb2\u4e86\u8fd9\u4e48\u591a\uff0c\u6211\u4eec\u6765\u770b\u770b\u4e00\u4e9b\u5e38\u7528\u5b57\u7b26\u7684\u8f6c\u4e49\u5e8f\u5217\u4ee5\u53ca\u542b\u4e49\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Unicode \u5b57\u7b26\u503c<\/td>\n\u8f6c\u4e49\u5e8f\u5217<\/td>\n\u542b\u4e49<\/td>\n<\/tr>\n
\\u0009<\/td>\n\\t<\/td>\n\u5236\u8868\u7b26<\/td>\n<\/tr>\n
\\u000A<\/td>\n\\n<\/td>\n\u6362\u884c<\/td>\n<\/tr>\n
\\u000D<\/td>\n\\r<\/td>\n\u56de\u8f66<\/td>\n<\/tr>\n
\\u0022<\/td>\n\\”<\/td>\n\u53cc\u5f15\u53f7<\/td>\n<\/tr>\n
\\u0027<\/td>\n\\’<\/td>\n\u5355\u5f15\u53f7<\/td>\n<\/tr>\n
\\u005C<\/td>\n\\\\<\/td>\n\u53cd\u659c\u6760<\/td>\n<\/tr>\n
\\u2028<\/td>\n<\/td>\n\u884c\u5206\u9694\u7b26<\/td>\n<\/tr>\n
\\u2029<\/td>\n<\/td>\n\u6bb5\u843d\u5206\u9694\u7b26<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Line Terminators<\/h2>\n
Line Terminators\uff0c\u4e2d\u6587\u8bd1\u6587\u884c\u7ec8\u7ed3\u7b26<\/code>\u3002\u50cf\u7a7a\u767d\u5b57\u7b26\u4e00\u6837\uff0c\u884c\u7ec8\u7ed3\u7b26<\/code>\u53ef\u7528\u4e8e\u6539\u5584\u6e90\u6587\u672c\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n
\u5728 ES5 \u4e2d\uff0c\u6709\u56db\u4e2a\u5b57\u7b26\u88ab\u8ba4\u4e3a\u662f\u884c\u7ec8\u7ed3\u7b26<\/code>\uff0c\u5176\u4ed6\u7684\u6298\u884c\u5b57\u7b26\u90fd\u4f1a\u88ab\u89c6\u4e3a\u7a7a\u767d\u3002<\/p>\n
\u8fd9\u56db\u4e2a\u5b57\u7b26\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n\n\n\n\n\n
\u5b57\u7b26\u7f16\u7801\u503c<\/th>\n\u540d\u79f0<\/th>\n<\/tr>\n<\/thead>\n
\\u000A<\/td>\n\u6362\u884c\u7b26<\/td>\n<\/tr>\n
\\u000D<\/td>\n\u56de\u8f66\u7b26<\/td>\n<\/tr>\n
\\u2028<\/td>\n\u884c\u5206\u9694\u7b26<\/td>\n<\/tr>\n
\\u2029<\/td>\n\u6bb5\u843d\u5206\u9694\u7b26<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Function<\/h2>\n
\u8bd5\u60f3\u6211\u4eec\u5199\u8fd9\u6837\u4e00\u6bb5\u4ee3\u7801\uff0c\u80fd\u5426\u6b63\u786e\u8fd0\u884c\uff1a<\/p>\n
<\/p>\n
var<\/span> log<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>\"var a = '1\\t23';console.log(a)\"<\/span>)<\/span>;<\/span>\nlog<\/span>(<\/span>)<\/span><\/pre>\n<\/div>\n
\u7b54\u6848\u662f\u53ef\u4ee5\uff0c\u90a3\u4e0b\u9762\u8fd9\u6bb5\u5462\uff1a<\/p>\n
<\/p>\n
var<\/span> log<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>\"var a = '1\\n23';console.log(a)\"<\/span>)<\/span>;<\/span>\nlog<\/span>(<\/span>)<\/span><\/pre>\n<\/div>\n
\u7b54\u6848\u662f\u4e0d\u53ef\u4ee5\uff0c\u4f1a\u62a5\u9519 Uncaught SyntaxError: Invalid or unexpected token<\/code>\u3002<\/p>\n
\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n
\u8fd9\u662f\u56e0\u4e3a\u5728 Function \u6784\u9020\u51fd\u6570\u7684\u5b9e\u73b0\u4e2d\uff0c\u9996\u5148\u4f1a\u5c06\u51fd\u6570\u4f53\u4ee3\u7801\u5b57\u7b26\u4e32\u8fdb\u884c\u4e00\u6b21 ToString<\/code> \u64cd\u4f5c\uff0c\u8fd9\u65f6\u5019\u5b57\u7b26\u4e32\u53d8\u6210\u4e86\uff1a<\/p>\n
<\/p>\n
var a = '1\n23';console.log(a)\n<\/code><\/pre>\n<\/div>\n
\u7136\u540e\u518d\u68c0\u6d4b\u4ee3\u7801\u5b57\u7b26\u4e32\u662f\u5426\u7b26\u5408\u4ee3\u7801\u89c4\u8303\uff0c\u5728 JavaScript \u4e2d\uff0c\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u4e2d\u662f\u4e0d\u5141\u8bb8\u6362\u884c\u7684<\/strong>\uff0c\u8fd9\u5c31\u5bfc\u81f4\u4e86\u62a5\u9519\u3002<\/p>\n
\u4e3a\u4e86\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u5c06\u4ee3\u7801\u4fee\u6539\u4e3a\uff1a<\/p>\n
<\/p>\n
var<\/span> log<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>\"var a = '1\\\\n23';console.log(a)\"<\/span>)<\/span>;<\/span>\nlog<\/span>(<\/span>)<\/span><\/pre>\n<\/div>\n
\u5176\u5b9e\u4e0d\u6b62 \\n<\/code>\uff0c\u5176\u4ed6\u4e09\u79cd \u884c\u7ec8\u7ed3\u7b26<\/code>\uff0c\u5982\u679c\u4f60\u5728\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u4e2d\u76f4\u63a5\u4f7f\u7528\uff0c\u90fd\u4f1a\u5bfc\u81f4\u62a5\u9519\uff01<\/p>\n
\u4e4b\u6240\u4ee5\u8bb2\u8fd9\u4e2a\u95ee\u9898\uff0c\u662f\u56e0\u4e3a\u5728\u6a21\u677f\u5f15\u64ce\u7684\u5b9e\u73b0\u4e2d\uff0c\u5c31\u662f\u4f7f\u7528\u4e86 Function \u6784\u9020\u51fd\u6570\uff0c\u5982\u679c\u6211\u4eec\u5728\u6a21\u677f\u5b57\u7b26\u4e32\u4e2d\u4f7f\u7528\u4e86 \u884c\u7ec8\u7ed3\u7b26<\/code>\uff0c\u4fbf\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e00\u6837\u7684\u9519\u8bef\uff0c\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u8981\u5bf9\u8fd9\u56db\u79cd \u884c\u7ec8\u7ed3\u7b26<\/code> \u8fdb\u884c\u7279\u6b8a\u7684\u5904\u7406\u3002<\/p>\n
\u7279\u6b8a\u5b57\u7b26<\/h2>\n
\u9664\u4e86\u8fd9\u56db\u79cd \u884c\u7ec8\u7ed3\u7b26<\/code> \u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u8981\u5bf9\u4e24\u4e2a\u5b57\u7b26\u8fdb\u884c\u5904\u7406\u3002<\/p>\n
\u4e00\u4e2a\u662f \\<\/code>\u3002<\/p>\n
\u6bd4\u5982\u8bf4\u6211\u4eec\u7684\u6a21\u677f\u5185\u5bb9\u4e2d\u4f7f\u7528\u4e86\\<\/code>:<\/p>\n
<\/p>\n
var<\/span> log<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>\"var a = '1\\23';console.log(a)\"<\/span>)<\/span>;<\/span>\nlog<\/span>(<\/span>)<\/span>;<\/span> \/\/ 1<\/span><\/pre>\n<\/div>\n
\u5176\u5b9e\u6211\u4eec\u662f\u60f3\u6253\u5370 ‘1\\23’\uff0c\u4f46\u662f\u56e0\u4e3a\u628a \\<\/code> \u5f53\u6210\u4e86\u7279\u6b8a\u5b57\u7b26\u7684\u6807\u8bb0\u8fdb\u884c\u5904\u7406\uff0c\u6240\u4ee5\u6700\u7ec8\u6253\u5370\u4e86 1\u3002<\/p>\n
\u540c\u6837\u7684\u9053\u7406\uff0c\u5982\u679c\u6211\u4eec\u5728\u4f7f\u7528\u6a21\u677f\u5f15\u64ce\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u4e86 \\<\/code> \u5b57\u7b26\u4e32\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u9519\u8bef\u7684\u5904\u7406\u3002<\/p>\n
\u7b2c\u4e8c\u4e2a\u662f '<\/code>\u3002<\/p>\n
\u5982\u679c\u6211\u4eec\u5728\u6a21\u677f\u5f15\u64ce\u4e2d\u4f7f\u7528\u4e86 '<\/code>\uff0c\u56e0\u4e3a\u6211\u4eec\u4f1a\u62fc\u63a5\u8bf8\u5982 p.push('<\/code> ')<\/code> \u7b49\u5b57\u7b26\u4e32\uff0c\u56e0\u4e3a '<\/code> \u7684\u539f\u56e0\uff0c\u5b57\u7b26\u4e32\u4f1a\u88ab\u9519\u8bef\u62fc\u63a5\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n
\u6240\u4ee5\u603b\u5171\u6211\u4eec\u9700\u8981\u5bf9\u516d\u79cd\u5b57\u7b26\u8fdb\u884c\u7279\u6b8a\u5904\u7406\uff0c\u5904\u7406\u7684\u65b9\u5f0f\uff0c\u5c31\u662f\u6b63\u5219\u5339\u914d\u51fa\u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\uff0c\u7136\u540e\u6bd4\u5982\u5c06 \\n<\/code> \u66ff\u6362\u6210 \\\\n<\/code>\uff0c\\<\/code> \u66ff\u6362\u6210 \\\\<\/code>\uff0c'<\/code> \u66ff\u6362\u6210 \\\\'<\/code>\uff0c\u5904\u7406\u7684\u4ee3\u7801\u4e3a\uff1a<\/p>\n
<\/p>\n
var<\/span> escapes<\/span> =<\/span> {<\/span>\n    \"'\"<\/span>: \"'\"<\/span>,<\/span>\n    '\\\\'<\/span>: '\\\\'<\/span>,<\/span>\n    '\\r'<\/span>: 'r'<\/span>,<\/span>\n    '\\n'<\/span>: 'n'<\/span>,<\/span>\n    '\\u2028'<\/span>: 'u2028'<\/span>,<\/span>\n    '\\u2029'<\/span>: 'u2029'<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> escapeRegExp<\/span> =<\/span> \/<\/span>\\\\|'|\\r|\\n|\\u2028|\\u2029\/<\/span>g<\/span>;<\/span>\n\nvar<\/span> escapeChar<\/span> =<\/span> function<\/span>(<\/span>match<\/span>)<\/span> {<\/span>\n    return<\/span> '\\\\'<\/span> +<\/span> escapes<\/span>[<\/span>match<\/span>]<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u6d4b\u8bd5\u4e00\u4e0b\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> 'console.log(\"I am \\n Kevin\");'<\/span>;<\/span>\nvar<\/span> newStr<\/span> =<\/span> str<\/span>.<\/span>replace<\/span>(<\/span>escapeRegExp<\/span>,<\/span> escapeChar<\/span>)<\/span>;<\/span>\n\neval<\/span>(<\/span>newStr<\/span>)<\/span>\n\/\/ I am <\/span>\n\/\/ Kevin<\/span><\/pre>\n<\/div>\n
replace<\/h2>\n
\u6211\u4eec\u6765\u8bb2\u4e00\u8bb2\u5b57\u7b26\u4e32\u7684 replace \u51fd\u6570\uff1a<\/p>\n
\u8bed\u6cd5\u4e3a\uff1a<\/p>\n
\n
str.replace(regexp|substr, newSubStr|function)\n<\/code><\/pre>\n<\/div>\n
replace \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u4f20\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4e5f\u53ef\u4ee5\u4f20\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u4f20\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u4e5f\u53ef\u4ee5\u4f20\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n
\u6211\u4eec\u91cd\u70b9\u770b\u4e0b\u4f20\u5165\u51fd\u6570\u7684\u60c5\u51b5\uff0c\u7b80\u5355\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> 'hello world'<\/span>;<\/span>\nvar<\/span> newStr<\/span> =<\/span> str<\/span>.<\/span>replace<\/span>(<\/span>'world'<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    return<\/span> match<\/span> +<\/span> '!'<\/span>\n}<\/span>)<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>newStr<\/span>)<\/span>;<\/span> \/\/ hello world!<\/span><\/pre>\n<\/div>\n
match \u8868\u793a\u5339\u914d\u5230\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u51fd\u6570\u7684\u53c2\u6570\u5176\u5b9e\u4e0d\u6b62\u6709 match\uff0c\u6211\u4eec\u770b\u4e2a\u66f4\u590d\u6742\u7684\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
function<\/span> replacer<\/span>(<\/span>match<\/span>,<\/span> p1<\/span>,<\/span> p2<\/span>,<\/span> p3<\/span>,<\/span> offset<\/span>,<\/span> string<\/span>)<\/span> {<\/span>\n    \/\/ match\uff0c\u8868\u793a\u5339\u914d\u7684\u5b50\u4e32 abc12345#$*%<\/span>\n    \/\/ p1\uff0c\u7b2c 1 \u4e2a\u62ec\u53f7\u5339\u914d\u7684\u5b57\u7b26\u4e32 abc<\/span>\n    \/\/ p2\uff0c\u7b2c 2 \u4e2a\u62ec\u53f7\u5339\u914d\u7684\u5b57\u7b26\u4e32 12345<\/span>\n    \/\/ p3\uff0c\u7b2c 3 \u4e2a\u62ec\u53f7\u5339\u914d\u7684\u5b57\u7b26\u4e32 #$*%<\/span>\n    \/\/ offset\uff0c\u5339\u914d\u5230\u7684\u5b50\u5b57\u7b26\u4e32\u5728\u539f\u5b57\u7b26\u4e32\u4e2d\u7684\u504f\u79fb\u91cf 0<\/span>\n    \/\/ string\uff0c\u88ab\u5339\u914d\u7684\u539f\u5b57\u7b26\u4e32 abc12345#$*%<\/span>\n    return<\/span> [<\/span>p1<\/span>,<\/span> p2<\/span>,<\/span> p3<\/span>]<\/span>.<\/span>join<\/span>(<\/span>' - '<\/span>)<\/span>;<\/span>\n}<\/span>\nvar<\/span> newString<\/span> =<\/span> 'abc12345#$*%'<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span>([^\\d]*)(\\d*)([^\\w]*)\/<\/span><\/span>,<\/span> replacer<\/span>)<\/span>;<\/span> \/\/ abc - 12345 - #$*%<\/span><\/pre>\n<\/div>\n
\u53e6\u5916\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5e76\u4e14\u5176\u4e3a\u5168\u5c40\u5339\u914d\u6a21\u5f0f\uff0c \u90a3\u4e48\u8fd9\u4e2a\u65b9\u6cd5\u5c06\u88ab\u591a\u6b21\u8c03\u7528\uff0c\u6bcf\u6b21\u5339\u914d\u90fd\u4f1a\u88ab\u8c03\u7528\u3002<\/p>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u679c\u6211\u4eec\u8981\u5728\u4e00\u6bb5\u5b57\u7b26\u4e32\u4e2d\u5339\u914d\u51fa <%=xxx%><\/code> \u4e2d\u7684\u503c\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<li><a href=\"<%=www.baidu.com%>\"><%=baidu%><\/a><\/li>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=(.+?)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> p1<\/span>,<\/span> offset<\/span>,<\/span> string<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>p1<\/span>)<\/span>;<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>offset<\/span>)<\/span>;<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>string<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u4f20\u5165\u7684\u51fd\u6570\u4f1a\u88ab\u6267\u884c\u4e24\u6b21\uff0c\u7b2c\u4e00\u6b21\u7684\u6253\u5370\u7ed3\u679c\u4e3a\uff1a<\/p>\n
<\/p>\n
<%=www.baidu.com%>\nwww.baidu.com\n13\n<li><a href=\"<%=www.baidu.com%>\"><%=baidu%><\/a><\/li>\n<\/code><\/pre>\n<\/div>\n
\u7b2c\u4e8c\u6b21\u7684\u6253\u5370\u7ed3\u679c\u4e3a\uff1a<\/p>\n
<\/p>\n
<%=baidu%>\n'baidu'\n33\n<li><a href=\"<%=www.baidu.com%>\"><%=baidu%><\/a><\/li>\n<\/code><\/pre>\n<\/div>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u521b\u5efa<\/h2>\n
\u5f53\u6211\u4eec\u8981\u5efa\u7acb\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u521b\u5efa\uff1a<\/p>\n
\n
var<\/span> reg<\/span> =<\/span> \/<\/span>ab+c\/<\/span>i<\/span>;<\/span><\/pre>\n<\/div>\n
\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6784\u9020\u51fd\u6570\u7684\u65b9\u5f0f\uff1a<\/p>\n
\n
new<\/span> RegExp<\/span>(<\/span>'ab+c'<\/span>,<\/span> 'i'<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff1a\u6bcf\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a source \u5c5e\u6027\uff0c\u8fd4\u56de\u5f53\u524d\u6b63\u5219\u8868\u8fbe\u5f0f\u5bf9\u8c61\u7684\u6a21\u5f0f\u6587\u672c\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n
<\/p>\n
var<\/span> regex<\/span> =<\/span> \/<\/span>fooBar\/<\/span>ig<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>regex<\/span>.<\/span>source<\/span>)<\/span>;<\/span> \/\/ \"fooBar\"\uff0c\u4e0d\u5305\u542b \/...\/ \u548c \"ig\"\u3002<\/span><\/pre>\n<\/div>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u7279\u6b8a\u5b57\u7b26<\/h2>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u6709\u4e00\u4e9b\u7279\u6b8a\u5b57\u7b26\uff0c\u6bd4\u5982 \\d<\/code> \u5c31\u8868\u793a\u4e86\u5339\u914d\u4e00\u4e2a\u6570\u5b57\uff0c\u7b49\u4ef7\u4e8e [0-9]\u3002<\/p>\n
\u5728\u4e0a\u8282\uff0c\u6211\u4eec\u4f7f\u7528 \/<%=(.+?)%>\/g<\/code> \u6765\u5339\u914d <%=xxx%><\/code>\uff0c\u7136\u800c\u5728 underscore \u7684\u5b9e\u73b0\u4e2d\uff0c\u7528\u7684\u5374\u662f \/<%=([\\s\\S]+?)%>\/g<\/code>\u3002<\/p>\n
\u6211\u4eec\u77e5\u9053 \\s \u8868\u793a\u5339\u914d\u4e00\u4e2a\u7a7a\u767d\u7b26\uff0c\u5305\u62ec\u7a7a\u683c\u3001\u5236\u8868\u7b26\u3001\u6362\u9875\u7b26\u3001\u6362\u884c\u7b26\u548c\u5176\u4ed6 Unicode \u7a7a\u683c\uff0c\\S
\n\u5339\u914d\u4e00\u4e2a\u975e\u7a7a\u767d\u7b26\uff0c[\\s\\S]\u5c31\u8868\u793a\u5339\u914d\u6240\u6709\u7684\u5185\u5bb9\uff0c\u53ef\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u4e0d\u76f4\u63a5\u4f7f\u7528 .<\/code> \u5462\uff1f<\/p>\n
\u6211\u4eec\u53ef\u80fd\u4ee5\u4e3a .<\/code> \u5339\u914d\u4efb\u610f\u5355\u4e2a\u5b57\u7b26\uff0c\u5b9e\u9645\u4e0a\uff0c\u5e76\u4e0d\u662f\u5982\u6b64\uff0c .<\/code>\u5339\u914d\u9664\u884c\u7ec8\u7ed3\u7b26<\/code>\u4e4b\u5916\u7684\u4efb\u4f55\u5355\u4e2a\u5b57\u7b26\uff0c\u4e0d\u4fe1\u6211\u4eec\u505a\u4e2a\u8bd5\u9a8c\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<%=hello world%>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=(.+?)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span> \/\/ <%=hello world%><\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u4f46\u662f\u5982\u679c\u6211\u4eec\u5728 hello world \u4e4b\u95f4\u52a0\u4e0a\u4e00\u4e2a\u884c\u7ec8\u7ed3\u7b26<\/code>\uff0c\u6bd4\u5982\u8bf4 ‘\\u2029’\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<%=hello \\u2029 world%>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=(.+?)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u56e0\u4e3a\u5339\u914d\u4e0d\u5230\uff0c\u6240\u4ee5\u4e5f\u4e0d\u4f1a\u6267\u884c console.log \u51fd\u6570\u3002<\/p>\n
\u4f46\u662f\u6539\u6210 \/<%=([\\s\\S]+?)%>\/g<\/code> \u5c31\u53ef\u4ee5\u6b63\u5e38\u5339\u914d\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<%=hello \\u2029 world%>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=([\\s\\S]+?)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span> \/\/ <%=hello \u2029 world%><\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u60f0\u6027\u5339\u914d<\/h2>\n
\u4ed4\u7ec6\u770b \/<%=([\\s\\S]+?)%>\/g<\/code> \u8fd9\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u77e5\u9053 x+<\/code> \u8868\u793a\u5339\u914d x<\/code> 1 \u6b21\u6216\u591a\u6b21\u3002x?<\/code>\u8868\u793a\u5339\u914d x<\/code> 0 \u6b21\u6216 1 \u6b21\uff0c\u4f46\u662f +?<\/code> \u662f\u4e2a\u4ec0\u4e48\u9b3c\uff1f<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u5728\u6570\u91cf\u8bcd *\u3001+\u3001? \u6216 {}, \u4efb\u610f\u4e00\u4e2a\u540e\u9762\u7d27\u8ddf\u8be5\u7b26\u53f7\uff08?\uff09\uff0c\u4f1a\u4f7f\u6570\u91cf\u8bcd\u53d8\u4e3a\u975e\u8d2a\u5a6a\uff08 non-greedy\uff09 \uff0c\u5373\u5339\u914d\u6b21\u6570\u6700\u5c0f\u5316\u3002\u53cd\u4e4b\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u662f\u8d2a\u5a6a\u7684\uff08greedy\uff09\uff0c\u5373\u5339\u914d\u6b21\u6570\u6700\u5927\u5316\u3002<\/p>\n
\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
console.log(\"aaabc\".replace(\/a+\/g, \"d\")); \/\/ dbc\n\nconsole.log(\"aaabc\".replace(\/a+?\/g, \"d\")); \/\/ dddbc\n<\/code><\/pre>\n<\/div>\n
\u5728\u8fd9\u91cc\u6211\u4eec\u5e94\u8be5\u4f7f\u7528\u975e\u60f0\u6027\u5339\u914d\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<li><a href=\"<%=www.baidu.com%>\"><%=baidu%><\/a><\/li>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=(.+?)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>\n\n\/\/ <%=www.baidu.com%><\/span>\n\/\/ <%=baidu%><\/span><\/pre>\n<\/div>\n
\u5982\u679c\u6211\u4eec\u4f7f\u7528\u60f0\u6027\u5339\u914d\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> '<li><a href=\"<%=www.baidu.com%>\"><%=baidu%><\/a><\/li>'<\/span>\n\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span><%=(.+)%>\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>match<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>\n\n\/\/ <%=www.baidu.com%>\"><%=baidu%><\/span><\/pre>\n<\/div>\n
template<\/h2>\n
\u8bb2\u5b8c\u9700\u8981\u7684\u77e5\u8bc6\u70b9\uff0c\u6211\u4eec\u5f00\u59cb\u8bb2 underscore \u6a21\u677f\u5f15\u64ce\u7684\u5b9e\u73b0\u3002<\/p>\n
\u4e0e\u6211\u4eec\u4e0a\u7bc7\u4f7f\u7528\u6570\u7ec4\u7684 push \uff0c\u6700\u540e\u518d join \u7684\u65b9\u6cd5\u4e0d\u540c\uff0cunderscore \u4f7f\u7528\u7684\u662f\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u65b9\u5f0f\u3002<\/p>\n
\u6bd4\u5982\u4e0b\u9762\u8fd9\u6837\u4e00\u6bb5\u6a21\u677f\u5b57\u7b26\u4e32\uff1a<\/p>\n
<\/p>\n
<%for ( var i = 0; i < users.length; i++ ) { %>\n    <li>\n        <a href=\"<%=users[i].url%>\">\n            <%=users[i].name%>\n        <\/a>\n    <\/li>\n<% } %>\n<\/code><\/pre>\n<\/div>\n
\u6211\u4eec\u5148\u5c06 <%=xxx%><\/code> \u66ff\u6362\u6210 '+ xxx +'<\/code>\uff0c\u518d\u5c06 <%xxx%><\/code> \u66ff\u6362\u6210 '; xxx __p+='<\/code>:<\/p>\n
<\/p>\n
var __p='';\nwith(obj){\n__p+='\n\n';for ( var i = 0; i < users.length; i++ ) { __p+='\n    <li>\n        <a href=\"'+ users[i].url + '\">\n            '+ users[i].name +'\n        <\/a>\n    <\/li>\n';  } __p+='\n\n';\n};\nreturn __p;\n<\/code><\/pre>\n<\/div>\n
\u6574\u7406\u4e0b\u4ee3\u7801\u5c31\u662f\uff1a<\/p>\n
<\/p>\n
var<\/span> __p<\/span>=<\/span>''<\/span>;<\/span>\nwith<\/span>(<\/span>obj<\/span>)<\/span>{<\/span>\n    __p<\/span>+=<\/span>''<\/span>;<\/span>\n    for<\/span> (<\/span> var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> users<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span> )<\/span> {<\/span> \n        __p<\/span>+=<\/span>'<li><a href=\"'<\/span>+<\/span> users<\/span>[<\/span>i<\/span>]<\/span>.<\/span>url<\/span> +<\/span> '\"> '<\/span>+<\/span> users<\/span>[<\/span>i<\/span>]<\/span>.<\/span>name<\/span> +<\/span>'<\/a><\/li>'<\/span>;<\/span>\n    }<\/span>\n    __p<\/span>+=<\/span>''<\/span>;<\/span>\n}<\/span>;<\/span>\nreturn<\/span> __p<\/span><\/pre>\n<\/div>\n
\u7136\u540e\u6211\u4eec\u5c06 __p<\/code> \u8fd9\u6bb5\u4ee3\u7801\u5b57\u7b26\u4e32\u4f20\u5165 Function \u6784\u9020\u51fd\u6570\u4e2d\uff1a<\/p>\n
\n
var<\/span> render<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>data<\/span>,<\/span> __p<\/span>)<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u6267\u884c\u8fd9\u4e2a render \u51fd\u6570\uff0c\u4f20\u5165\u9700\u8981\u7684 data \u6570\u636e\uff0c\u5c31\u53ef\u4ee5\u8fd4\u56de\u4e00\u6bb5 HTML \u5b57\u7b26\u4e32\uff1a<\/p>\n
\n
render<\/span>(<\/span>data<\/span>)<\/span><\/pre>\n<\/div>\n
\u7b2c\u4e94\u7248 – \u7279\u6b8a\u5b57\u7b26\u7684\u5904\u7406<\/h2>\n
\u6211\u4eec\u63a5\u7740\u4e0a\u7bc7\u7684\u7b2c\u56db\u7248<\/a>\u8fdb\u884c\u4e66\u5199\uff0c\u4e0d\u8fc7\u52a0\u5165\u5bf9\u7279\u6b8a\u5b57\u7b26\u7684\u8f6c\u4e49\u4ee5\u53ca\u4f7f\u7528\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u65b9\u5f0f\uff1a<\/p>\n
<\/p>\n
\/\/ \u7b2c\u4e94\u7248<\/span>\nvar<\/span> settings<\/span> =<\/span> {<\/span>\n    \/\/ \u6c42\u503c<\/span>\n    evaluate<\/span>: \/<\/span><%([\\s\\S]+?)%>\/<\/span>g<\/span>,<\/span>\n    \/\/ \u63d2\u5165<\/span>\n    interpolate<\/span>: \/<\/span><%=([\\s\\S]+?)%>\/<\/span>g<\/span>,<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> escapes<\/span> =<\/span> {<\/span>\n    \"'\"<\/span>: \"'\"<\/span>,<\/span>\n    '\\\\'<\/span>: '\\\\'<\/span>,<\/span>\n    '\\r'<\/span>: 'r'<\/span>,<\/span>\n    '\\n'<\/span>: 'n'<\/span>,<\/span>\n    '\\u2028'<\/span>: 'u2028'<\/span>,<\/span>\n    '\\u2029'<\/span>: 'u2029'<\/span>\n}<\/span>;<\/span>\n\nvar<\/span> escapeRegExp<\/span> =<\/span> \/<\/span>\\\\|'|\\r|\\n|\\u2028|\\u2029\/<\/span>g<\/span>;<\/span>\n\nvar<\/span> template<\/span> =<\/span> function<\/span>(<\/span>text<\/span>)<\/span> {<\/span>\n\n    var<\/span> source<\/span> =<\/span> \"var __p='';\\n\"<\/span>;<\/span>\n    source<\/span> =<\/span> source<\/span> +<\/span> \"with(obj){\\n\"<\/span>\n    source<\/span> =<\/span> source<\/span> +<\/span> \"__p+='\"<\/span>;<\/span>\n\n    var<\/span> main<\/span> =<\/span> text<\/span>\n    .<\/span>replace<\/span>(<\/span>escapeRegExp<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span> {<\/span>\n        return<\/span> '\\\\'<\/span> +<\/span> escapes<\/span>[<\/span>match<\/span>]<\/span>;<\/span>\n    }<\/span>)<\/span>\n    .<\/span>replace<\/span>(<\/span>settings<\/span>.<\/span>interpolate<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> interpolate<\/span>)<\/span>{<\/span>\n        return<\/span> \"'+\\n\"<\/span> +<\/span> interpolate<\/span> +<\/span> \"+\\n'\"<\/span>\n    }<\/span>)<\/span>\n    .<\/span>replace<\/span>(<\/span>settings<\/span>.<\/span>evaluate<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> evaluate<\/span>)<\/span>{<\/span>\n        return<\/span> \"';\\n \"<\/span> +<\/span> evaluate<\/span> +<\/span> \"\\n__p+='\"<\/span>\n    }<\/span>)<\/span>\n\n    source<\/span> =<\/span> source<\/span> +<\/span> main<\/span> +<\/span> \"';\\n }; \\n return __p;\"<\/span>;<\/span>\n\n    console<\/span>.<\/span>log<\/span>(<\/span>source<\/span>)<\/span>\n\n    var<\/span> render<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>'obj'<\/span>,<\/span>  source<\/span>)<\/span>;<\/span>\n\n    return<\/span> render<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u5b8c\u6574\u7684\u4f7f\u7528\u4ee3\u7801\u53ef\u4ee5\u53c2\u8003 template \u793a\u4f8b\u4e94<\/a>\u3002<\/p>\n
\u7b2c\u516d\u7248 – \u7279\u6b8a\u503c\u7684\u5904\u7406<\/h2>\n
\u4e0d\u8fc7\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/p>\n
\u5982\u679c\u6570\u636e\u4e2d users[i].url<\/code> \u4e0d\u5b58\u5728\u600e\u4e48\u529e\uff1f\u6b64\u65f6\u53d6\u503c\u7684\u7ed3\u679c\u4e3a undefined\uff0c\u6211\u4eec\u77e5\u9053\uff1a<\/p>\n
\n
'1'<\/span> +<\/span> undefined<\/span> \/\/ \"1undefined\"<\/span><\/pre>\n<\/div>\n
\u5c31\u76f8\u5f53\u4e8e\u62fc\u63a5\u4e86 undefined \u5b57\u7b26\u4e32\uff0c\u8fd9\u80af\u5b9a\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u52a0\u5165\u4e00\u70b9\u5224\u65ad\uff1a<\/p>\n
<\/p>\n
.<\/span>replace<\/span>(<\/span>settings<\/span>.<\/span>interpolate<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> interpolate<\/span>)<\/span>{<\/span>\n    return<\/span> \"'+\\n\"<\/span> +<\/span> (<\/span>interpolate<\/span> ==<\/span> null<\/span> ? ''<\/span> : interpolate<\/span>)<\/span> +<\/span> \"+\\n'\"<\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u4f46\u662f\u5427\uff0c\u6211\u5c31\u662f\u4e0d\u559c\u6b22\u5199\u4e24\u904d interpolate \u2026\u2026 \u55ef\uff1f\u90a3\u5c31\u8fd9\u6837\u5427\uff1a<\/p>\n
<\/p>\n
var<\/span> source<\/span> =<\/span> \"var __t, __p='';\\n\"<\/span>;<\/span>\n\n...\n\n.<\/span>replace<\/span>(<\/span>settings<\/span>.<\/span>interpolate<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> interpolate<\/span>)<\/span>{<\/span>\n    return<\/span> \"'+\\n((__t=(\"<\/span> +<\/span> interpolate<\/span> +<\/span> \"))==null?'':__t)+\\n'\"<\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u5176\u5b9e\u5c31\u76f8\u5f53\u4e8e\uff1a<\/p>\n
<\/p>\n
var<\/span> __t<\/span>;<\/span>\n\nvar<\/span> result<\/span> =<\/span> (<\/span>__t<\/span> =<\/span> interpolate<\/span>)<\/span> ==<\/span> null<\/span> ? ''<\/span> : __t<\/span>;<\/span><\/pre>\n<\/div>\n
\u5b8c\u6574\u7684\u4f7f\u7528\u4ee3\u7801\u53ef\u4ee5\u53c2\u8003 template \u793a\u4f8b\u516d<\/a>\u3002<\/p>\n
\u7b2c\u4e03\u7248<\/h2>\n
\u73b0\u5728\u6211\u4eec\u4f7f\u7528\u7684\u65b9\u5f0f\u662f\u5c06\u6a21\u677f\u5b57\u7b26\u4e32\u8fdb\u884c\u591a\u6b21\u66ff\u6362\uff0c\u7136\u800c\u5728 underscore \u7684\u5b9e\u73b0\u4e2d\uff0c\u53ea\u8fdb\u884c\u4e86\u4e00\u6b21\u66ff\u6362\uff0c\u6211\u4eec\u6765\u770b\u770b underscore \u662f\u600e\u4e48\u5b9e\u73b0\u7684\uff1a<\/p>\n
<\/p>\n
var<\/span> template<\/span> =<\/span> function<\/span>(<\/span>text<\/span>)<\/span> {<\/span>\n    var<\/span> matcher<\/span> =<\/span> RegExp<\/span>(<\/span>[<\/span>\n        (<\/span>settings<\/span>.<\/span>interpolate<\/span>)<\/span>.<\/span>source<\/span>,<\/span>\n        (<\/span>settings<\/span>.<\/span>evaluate<\/span>)<\/span>.<\/span>source<\/span>\n    ]<\/span>.<\/span>join<\/span>(<\/span>'|'<\/span>)<\/span> +<\/span> '|$'<\/span>,<\/span> 'g'<\/span>)<\/span>;<\/span>\n\n    var<\/span> index<\/span> =<\/span> 0<\/span>;<\/span>\n    var<\/span> source<\/span> =<\/span> \"__p+='\"<\/span>;<\/span>\n\n    text<\/span>.<\/span>replace<\/span>(<\/span>matcher<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> interpolate<\/span>,<\/span> evaluate<\/span>,<\/span> offset<\/span>)<\/span> {<\/span>\n        source<\/span> +=<\/span> text<\/span>.<\/span>slice<\/span>(<\/span>index<\/span>,<\/span> offset<\/span>)<\/span>.<\/span>replace<\/span>(<\/span>escapeRegExp<\/span>,<\/span> function<\/span>(<\/span>match<\/span>)<\/span> {<\/span>\n            return<\/span> '\\\\'<\/span> +<\/span> escapes<\/span>[<\/span>match<\/span>]<\/span>;<\/span>\n        }<\/span>)<\/span>;<\/span>\n\n        index<\/span> =<\/span> offset<\/span> +<\/span> match<\/span>.<\/span>length<\/span>;<\/span>\n\n        if<\/span> (<\/span>interpolate<\/span>)<\/span> {<\/span>\n            source<\/span> +=<\/span> \"'+\\n((__t=(\"<\/span> +<\/span> interpolate<\/span> +<\/span> \"))==null?'':__t)+\\n'\"<\/span>;<\/span>\n        }<\/span> else<\/span> if<\/span> (<\/span>evaluate<\/span>)<\/span> {<\/span>\n            source<\/span> +=<\/span> \"';\\n\"<\/span> +<\/span> evaluate<\/span> +<\/span> \"\\n__p+='\"<\/span>;<\/span>\n        }<\/span>\n\n        return<\/span> match<\/span>;<\/span>\n    }<\/span>)<\/span>;<\/span>\n\n    source<\/span> +=<\/span> \"';\\n\"<\/span>;<\/span>\n\n    source<\/span> =<\/span> 'with(obj||{}){\\n'<\/span> +<\/span> source<\/span> +<\/span> '}\\n'<\/span>\n\n    source<\/span> =<\/span> \"var __t, __p='';\"<\/span> +<\/span>\n        source<\/span> +<\/span> 'return __p;\\n'<\/span>;<\/span>\n\n    var<\/span> render<\/span> =<\/span> new<\/span> Function<\/span>(<\/span>'obj'<\/span>,<\/span> source<\/span>)<\/span>;<\/span>\n\n    return<\/span> render<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
\u5176\u5b9e\u539f\u7406\u4e5f\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u5728\u6267\u884c\u591a\u6b21\u5339\u914d\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4e0d\u65ad\u590d\u5236\u5b57\u7b26\u4e32\uff0c\u5904\u7406\u5b57\u7b26\u4e32\uff0c\u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u6700\u540e\u62fc\u63a5\u9996\u5c3e\u4ee3\u7801\uff0c\u5f97\u5230\u6700\u7ec8\u7684\u4ee3\u7801\u5b57\u7b26\u4e32\u3002<\/p>\n
\u4e0d\u8fc7\u503c\u5f97\u4e00\u63d0\u7684\u662f\uff1a\u5728\u8fd9\u6bb5\u4ee3\u7801\u91cc\uff0cmatcher \u7684\u8868\u8fbe\u5f0f\u6700\u540e\u4e3a\uff1a\/<%=([\\s\\S]+?)%>|<%([\\s\\S]+?)%>|$\/g<\/code><\/p>\n
\u95ee\u9898\u662f\u4e3a\u4ec0\u4e48\u8fd8\u8981\u52a0\u4e2a |$<\/code> \u5462\uff1f\u6211\u4eec\u6765\u770b\u4e0b $\uff1a<\/p>\n
<\/p>\n
var<\/span> str<\/span> =<\/span> \"abc\"<\/span>;<\/span>\nstr<\/span>.<\/span>replace<\/span>(<\/span>\/<\/span>$\/<\/span>g<\/span>,<\/span> function<\/span>(<\/span>match<\/span>,<\/span> offset<\/span>)<\/span>{<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> match<\/span>)<\/span> \/\/ \u7a7a\u5b57\u7b26\u4e32<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>offset<\/span>)<\/span> \/\/ 3<\/span>\n    return<\/span> match<\/span>\n}<\/span>)<\/span><\/pre>\n<\/div>\n
\u6211\u4eec\u4e4b\u6240\u4ee5\u5339\u914d $\uff0c\u662f\u4e3a\u4e86\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\uff0c\u8fd9\u6837\u5f53\u6211\u4eec text.slice(index, offset)\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u622a\u53d6\u5230\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
\u5b8c\u6574\u7684\u4f7f\u7528\u4ee3\u7801\u53ef\u4ee5\u53c2\u8003 template \u793a\u4f8b\u4e03<\/a>\u3002<\/p>\n
\u6700\u7ec8\u7248<\/h2>\n
\u5176\u5b9e\u4ee3\u7801\u5199\u5230\u8fd9\u91cc\uff0c\u5c31\u5df2\u7ecf\u8ddf underscore \u7684\u5b9e\u73b0\u5f88\u63a5\u8fd1\u4e86\uff0c\u53ea\u662f underscore \u52a0\u5165\u4e86\u66f4\u591a\u7ec6\u8282\u7684\u5904\u7406\uff0c\u6bd4\u5982\uff1a<\/p>\n
    \n
  1. \u5bf9\u6570\u636e\u7684\u8f6c\u4e49\u529f\u80fd<\/li>\n
  2. \u53ef\u4f20\u5165\u914d\u7f6e\u9879<\/li>\n
  3. \u5bf9\u9519\u8bef\u7684\u5904\u7406<\/li>\n
  4. \u6dfb\u52a0 source \u5c5e\u6027\uff0c\u4ee5\u65b9\u4fbf\u67e5\u770b\u4ee3\u7801\u5b57\u7b26\u4e32<\/li>\n
  5. \u6dfb\u52a0\u4e86\u65b9\u4fbf\u8c03\u8bd5\u7684 print \u51fd\u6570<\/li>\n
  6. …<\/li>\n<\/ol>\n
    \u4f46\u662f\u8fd9\u4e9b\u5185\u5bb9\u90fd\u8fd8\u7b97\u7b80\u5355\uff0c\u5c31\u4e0d\u4e00\u7248\u4e00\u7248\u5199\u4e86\uff0c\u6700\u540e\u7684\u7248\u672c\u5728 template \u793a\u4f8b\u516b<\/a>\uff0c\u5982\u679c\u5bf9\u5176\u4e2d\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u7559\u8a00\u8ba8\u8bba\u3002<\/p>\n
    underscore \u7cfb\u5217<\/h2>\n
    underscore \u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a>\u3002<\/p>\n
    underscore \u7cfb\u5217\u9884\u8ba1\u5199\u516b\u7bc7\u5de6\u53f3\uff0c\u91cd\u70b9\u4ecb\u7ecd underscore \u4e2d\u7684\u4ee3\u7801\u67b6\u6784\u3001\u94fe\u5f0f\u8c03\u7528\u3001\u5185\u90e8\u51fd\u6570\u3001\u6a21\u677f\u5f15\u64ce\u7b49\u5185\u5bb9\uff0c\u65e8\u5728\u5e2e\u52a9\u5927\u5bb6\u9605\u8bfb\u6e90\u7801\uff0c\u4ee5\u53ca\u5199\u51fa\u81ea\u5df1\u7684 undercore\u3002<\/p>\n<\/td>\n
    \u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/70<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
    \u524d\u8a00 \u672c\u7bc7\u63a5\u7740\u4e0a\u7bc7 underscore \u7cfb\u5217\u4e4b\u5b9e\u73b0\u4e00\u4e2a\u6a21\u677f\u5f15\u64ce(\u4e0a)\u3002 \u9274\u4e8e\u672c\u7bc7\u6d89\u53ca\u7684\u77e5\u8bc6\u70b9\u592a\u591a\uff0c\u6211\u4eec\u5148\u6765\u4ecb\u7ecd\u4e0b\u4f1a\u7528\u5230\u7684\u77e5\u8bc6\u70b9\u3002 \u53cd\u659c\u6760\u7684\u4f5c\u7528 var txt…<\/p>\n
     Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1365","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1365"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1365"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1365\/revisions"}],"predecessor-version":[{"id":1476,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1365\/revisions\/1476"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}